Which of the Following Crosses Would Produce a 1:1 Ratio

Question

Which of the following crosses would produce a 1:1 ratio of phenotypes in the next generation?
A) AA × AA
B) AA × aa
C) Aa × Aa
D) Aa × aa
E) aa × aa

Accepted Answer

The cross Aa × aa will produce a 1:1 ratio of phenotypes, with half of the offspring being heterozygous (Aa) and the other half being homozygous recessive (aa).